And choosing able men out of all Israel, he appointed them rulers of the people, rulers over thousands, and over hundreds, and over fifties, and over tens.

And Moses chose able men out of all Israel, and made them heads over the people, chiefs of thousands, chiefs of hundreds, chiefs of fifties, and chiefs of tens.

and Moses chooseth men of ability out of all Israel, and maketh them chiefs over the people, heads of thousands, heads of hundreds, heads of fifties, and heads of tens,

And he made selection of able men out of all Israel, and made them heads over the people, captains of thousands, captains of hundreds and of fifties and of tens.

And choosing virtuous men from all of Israel, he appointed them as leaders of the people: tribunes, and leaders of hundreds, and of fifties, and of tens.

Et elegit Moses viros fortes ex toto Israel, et constituit eos capita super populum, principes super mille centuriones, quinquagenarios, ac decanos.

And Moses chose able men out of all Israel,.... He looked among them, and selected the best of them, such as most answered to the qualifications it was requisite they should have; and though only one of them is here mentioned, which is the first Jethro gave, yet no doubt they were all attended to, though not expressed:
and made them heads over the people; rulers, governors, judges, and officers; this is a general word, comprehending their several particular offices they sustained; which seem to be chiefly distinguished by the different numbers of people, or families, under them, otherwise their work and office were much the same:
rulers of thousands, rulers of hundreds, rulers of fifties, and rulers of tens; just as Jethro advised, Exodus 18:21. According to the Targum of Jonathan, the rulers of thousands were six hundred, rulers of hundreds 6000, rulers of fifties 12,000, and the rulers of tens 60,000; and so Jarchi; and the like account is given in both the Talmuds (x), where the whole is summed up, amounting to 78,600; which account Aben Ezra disapproves of, and thinks not credible: it is built upon the number of Israel at this time, when they came out of Egypt, being 600,000 men; and so if there was a ruler to every thousand men, there must be six hundred of them, and so on; but these thousands may intend not individual persons, but families, that these were appointed over, as the families of Israel and Judah are called their thousands, Micah 5:2 and this will serve greatly to reduce the number of these judges and officers.
(x) T. Hieros. Sanhedrin, fol. 19. 3. T. Bab. Sanhedrin, fol. 18. 1.

The judges chosen were arranged as chiefs (שׂרים) over thousands, hundreds, fifties, and tens, after the analogy of the military organization of the people on their march (Numbers 31:14), in such a manner, however, that this arrangement was linked on to the natural division of the people into tribes, families, etc. (see my Archologie, 140). For it is evident that the decimal division was not made in an arbitrary manner according to the number of heads, from the fact that, on the one hand, the judges were chosen from the heads of their tribes and according to their tribes (Deuteronomy 1:13); and on the other hand, the larger divisions of the tribes, viz., the families (mishpachoth), were also called thousands (Numbers 1:15; Numbers 10:4; Joshua 22:14, etc.), just because the number of their heads of families would generally average about a thousand; so that in all probability the hundreds, fifties, and tens denote smaller divisions of the nation, in which there were about this number of fathers. Thus in Arabic, for example, "the ten" is a term used to signify a family (cf. Hengstenberg, Dissertations v. ii. 343, and my Arch. 149). The difference between the harder or greater matters and the smaller matters consisted in this: questions which there was not definite law to decide were great or hard; whereas, on the other hand, those which could easily be decided from existing laws or general principles of equity were simple or small. (Vide John. Selden de Synedriis i. c. 16, in my Arch. 149, Not. 3, where the different views are discussed respecting the relative positions and competency of the various judges, about which there is no precise information given in the law.) So far as the total number of judges is concerned, all that can be affirmed with certainty is, that the estimated number of 600 judges over thousands, 6000 over hundreds, 12,000 over fifties, and 60,000 over tens, in all 78,600 judges, which is given by Grotius and in the Talmud, and according to which there must have been a judge for every seven adults, is altogether erroneous (cf. J. Selden l.c. pp. 339ff.). For if the thousands answered to the families (Mishpachoth), there cannot have been a thousand males in every one; and in the same way the hundreds, etc., are not to be understood as consisting of precisely that number of persons, but as larger or smaller family groups, the numerical strength of which we do not know. And even if we did know it, or were able to estimate it, this would furnish no criterion by which to calculate the number of the judges, for the text does not affirm that every one of these larger or smaller family groups had a judge of its own; in fact, the contrary may rather be inferred, from the fact that, according to Deuteronomy 1:15, the judges were chosen out of the heads of the tribes, so that the number of judges must have been smaller than that of the heads, and can hardly therefore have amounted to many hundreds, to say nothing of many thousands.